CSA HDR Inc Nutrient Analysis 11-20-2024

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Consulting Services Agreement between City of San Leandro and Last revised 10/28/2024 HDR, Inc. for Nutrient Alternatives Evaluation Exhibit A – Page 4 of 7 HDR will lead a draft sampling plan comments call for up to one hour (if needed). Up to two HDR team members will participate in this call. HDR will provide a list of future recommended sampling if necessary. DELIVERABLE T 2.2: Draft and final sampling plan in PDF format. Task 3 – Process Modelling HDR will prepare a liquid treatment process model to evaluate nutrient removal alternatives. The model will be calibrated with available WPCP process data. HDR will create a steady-state model based on historical plant performance data for the following reasons: To have a calibrated steady-state model that is specific to the WPCP. To verify and validate what existing unit processes have potential available capacity. To provide planning level facility needs to remove nutrients (using three alternative scenarios). The model will be prepared so that it can be used during the subsequent preliminary and final design phases of the project (if carried forward). Target an eventual effluent TIN concentration of 15 mg/L. Review the impact of increasing the solids residence time (SRT), given the variable loading and occasional problems from the milk processing plant. ASSUMPTIONS: H2OWorks will provide the physical sizes of the existing core unit processes (e.g., screen sizing, sedimentation basin dimensions, FFR media, and aeration basin volume/depth). The model calibration will be based on the last three to five years of historical plant performance data. The model calibration target is expected to be within approximately 5 to 15 percent of the historical data to be deemed “calibrated.” We have allocated up to 80 hours to set up and calibrate the model, and if additional effort is needed, a budget amendment will be required. HDR will provide treatment process sizing plus the corresponding energy and chemicals. DELIVERABLES T 3: A virtual meeting to coordinate and review inputs and parameters of existing conditions. Up to three HDR team members will attend this meeting (up-to-one-hour in duration). A virtual meeting to review the process model and confirm that the results reflect current operations before optimization efforts. Up to three HDR team members will attend this virtual meeting (up to two hours in duration). Docusign Envelope ID: F4C31A54-5BDC-41AE-BF85-10613D6DCA60